The DOE HEP program focuses on three scientific frontiers, namely, Energy, Intensity, and Cosmic, along with overarching research in Theory and Technology Research and Development to unravel deep fundamental questions about the dynamic universe. Studies at the three frontiers complement each other by accessing different natural symmetries and particle interactions through their respective specialized windows. Scientific simulations and advanced computing research and expertise are critical to the success of many of these studies, both theoretical and experimental.